The document discusses the pragmatic approach taken to implement OOXML support in OpenOffice/LibreOffice. Key aspects include: 1. Reusing existing binary filter code where possible to parse OOXML formats like DOCX, XLSX and PPTX for import and export. 2. Splitting monolithic filter classes into separate classes for data access and filter logic to allow reuse. 3. Abstracting common functionality like the Open Packaging Conventions container and attribute output. 4. Implementing new classes for DrawingML shape output and VML export for DOCX/PPTX while reusing existing Escher export code. 5. Separating MS file format filter code into independent

1. The Pragmatic Approach to OOXML Jan Holesovsky <kendy@suse.cz>

3. Open Packaging Conventions

4. DOCX – WordprocessingML, VML

5. XLSX – SpreadsheetML

6. PPTX – PresentationML, DrawingML

7. General improvements

8. Introduction

10. Lots of good and in-depth descriptions

14. Import implemented some time ago, mostly from scratch

16. OOXML improvements make the binary filters better too

17. Saved us a lot of time, quick results

18. Some general improvements too

20. DrawingML – drawings, images

21. PresentationML – presentations

22. SpreadsheetML – spreadsheets

23. WordprocessingML – documents

25. Open Packaging Conventions

29. Varargs for easier use

30. Possibility to reorder XML

31. DOCX

33. Mixed data, low-level stream access, the filter logic, etc.

34. But lots of good stuff to reuse in the docx export too

36. SwWW8Writer split into SwWW8Writer (access to the bytes in the stream) and WW8Export (the logic of the filter)

41. Obsolete, but DrawingML is not sufficient for DOCX

44. XLSX

47. To write SpreadsheetML, we extended them by SaveXML() methods

48. The most serious problem is that XLSX needs the records in another order than the binary xls in some cases

49. PPTX

51. The base class is mostly for the logic of the filter, like iterating over the slides

52. Layouts hardcoded in OOo and in the binary filter, but in PresentationML they are described the similar way as the master pages or slides

56. The slide backgrounds

57. General Improvements

60. Implemented for all MSO formats

63. Libsvxcore – the minimal library that could have been extracted from SVX

65. Only the MSO import/export libraries need libsvxmsfilter

67. SPRMs shared between writerfilter and sw

68. Get rid of IMPLEMENT_CONSTASCII_USTRING/ DECLARE_CONSTASCII_USTRING

69. Don't use SwAttrFnTab callbacks in .doc export

71. Ooxml02 – OPC, xls export redesign, base of the xlsx work

73. More testing, and enable it